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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c28f9ed455cd7e0091b7a8c7fdf5d71c2c9ea07ee44782b7a5ed777758854d' 
  AND token = 'NT1ItVFh+ITVUZ5c7ciS9TFx2e8ryN7UCsolSj5LRzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}